JPH0514340Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Purpose of the invention [Field of industrial application] This invention is a videotape recorder (hereinafter referred to as VTR).
It is called. This invention relates to a cassette detection device for reading a reflective cassette identification marker provided on the outer surface of a cassette.

[Conventional technology]

As shown in FIG. 4, the conventional cassette detection device includes a sensor 2 for reading the cassette identification marker 1, and an angle 3 for supporting the sensor 2.
and protrudes opposite to the cassette identification marker 1 of the cassette 5 installed in the VTR 4.
It is screwed to the base 6 of the VTR4. On the other hand, sensor 2 is cassette identification marker 1 of angle 3.
It is attached to the opposite surface.

[Problem that the invention attempts to solve]

However, with the sensor 2 mounting structure described above, errors tend to occur in the relative position and angle between the cassette 5 and the sensor 2 due to dimensional errors and misalignment of the mounting position of the cassette 5, resulting in erroneous identification of the cassette 5. It had some easy flaws.

This idea was made in view of the above circumstances,
The main purpose of this is to configure the sensor support member so that when the cassette is installed in a VTR, the cassette identification marker and the sensor face each other at a predetermined distance, and to prevent deviations in the relative position and angle between the cassette and the sensor. It is an object of the present invention to provide a cassette detection device which has a small amount of cassette detection and which does not misidentify a cassette.

(b) Structure of the invention This invention is a cassette detection device, which includes a sensor for reading a reflective cassette identification marker provided on the outer surface of a cassette for a videotape recorder, and a sensor for detecting the cassette from the base of the videotape recorder. a support member that protrudes to the side and comes into contact with the outer surface of the cassette on which the cassette identification marker is provided when the cassette is installed in a video tape recorder, and supports the sensor facing away from the cassette identification marker while separating the sensor from the cassette identification marker by a predetermined distance; , a shaft attached to the base, a lever attached to this shaft so as to rotate around this shaft to a predetermined position, and a lever that protrudes from this lever in the direction of rotation and whose protruding end touches the outer surface of the cassette. A holder that supports the sensor at a position closer to the lever than the abutting surface is formed, and the holder is wound with a spring that protrudes from the lever and biases the holder in a direction away from the lever. This is a cassette detection device movably supported by a pin.

In other words, this device is constructed so that when a cassette is attached to a VTR, a support member comes into contact with the outer surface on which the cassette identification marker is provided, thereby maintaining the distance between the cassette identification marker and the sensor at a predetermined distance. be. Here, the supporting member includes a shaft attached to a base, a lever attached to this shaft so as to rotate around this axis to a predetermined position, and a protruding end portion of the lever that protrudes from the lever in the direction of rotation. A contact surface that contacts the outer surface of the cassette is formed on the cassette, and a holder that supports the sensor at a position closer to the lever than the contact surface. Also,
The holder is movably supported by a pin that projects from the lever and is wound with a spring that urges the holder away from the lever.

〔Example〕

This invention will be described in detail below based on the embodiments shown in FIGS. 1 to 3. Note that this invention is not limited thereby.

In FIG. 3, the cassette detection device 7 includes a sensor 8 having the same configuration as the conventional one, and a base 10 of the VTR 9.
A supporting member that protrudes upward from the cassette 11 and comes into elastic contact with the outer surface of the cassette 11 on which the reflective cassette identification marker 12 is provided when the cassette 11 is mounted on the VTR 9, and supports the sensor 8 facing and separating the sensor 8 from the cassette identification marker 12 by a predetermined distance. It mainly consists of 13. In addition, in Fig. 3, 14, 14
is the cassette positioning pin, 15 is the cassette lid, 1
6 is the cassette lid opening angle.

The support member 13 has a shaft 17 vertically installed on the base 10.
It consists of a lever 18 that is rotatably attached to this shaft 17, and a holder 19 that holds the sensor 8. The lever 18 is configured to rotate from the cassette 11 side to a position parallel to its outer surface. As shown in FIG. 1, the holder 19 consists of a box with an inverted U-shape in longitudinal section, and the open side of the holder 19 has a sensor mounting board 2 with the sensor 8 mounted in the center.
0, and within the U-shape is a holder support shaft 21 as a pin that projects horizontally from the center of the closed side to the surface of the lever 18 outside the cassette 11.
is inserted. A coil spring 22 for biasing the holder 19 toward the cassette 11 is wound around the holder support shaft 21.
A holder stopper 23 is fitted into the end inside the holder 19 . Further, as shown in FIGS. 1 and 2, the left and right side walls of the holder 19 are formed such that their open side edges protrude from the sensor mounting board 20 by a predetermined length towards the cassette 11 side. Two abutment surfaces 24, 24 are formed in the center of the open side edge so as to be in close contact with both left and right sides of the cassette identification marker 12 on the outer surface of the cassette 11, respectively. Note that 25 is a sensor mounting plate holding piece.

Next, the usage condition of this cassette detection device 7 will be explained. First, when the cassette 11 is attached to the VTR 9, the holder 19 is pressed against the cassette 11 and moved away from the cassette 11, but the coil spring 22 causes the contact surfaces 24, 24 of the holder 19 to move away from the cassette 11.
is moved while coming into elastic contact with the outer surface of the cassette 11. Then, when the loading of the cassette 11 is completed,
The state shown in Figure 3 will be reached. Note that during the loading operation of the cassette 11, if the movement locus of the outer surface of the cassette 11 exceeds the movable range of the holder 19, the lever 18
can rotate in a direction away from the cassette 11.

By the above-described operation, the relative positional relationship between the sensor 8 and the cassette identification marker 12 can be ensured with high precision, and erroneous identification of the cassette 11 can be prevented.

(c) Effects of the invention In the cassette detection device of this invention, when a cassette is installed in a videotape recorder, the contact surface of the sensor support holder provided on the rotatable lever touches the cassette identification marker. It comes into contact with the outer surface of the provided cassette. At this time, the holder is
Since it is movably supported by a pin wrapped around a spring that protrudes from the lever and biases the holder away from the lever, the facing distance between the sensor and the reflective cassette identification marker is always maintained at a predetermined distance. is maintained. Therefore, according to the cassette detection device of this invention, when a cassette is installed in a videotape recorder, the deviation in relative position and angle between the sensor and the reflective cassette identification marker is reduced, and erroneous identification of the cassette is prevented. It can be prevented. Further, it is possible to design the sensor according to the focal length of the sensor, and by devising the shape of the contact surface of the holder, it is possible to prevent harmful effects caused by ambient light.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of the cassette detection device according to this invention, and FIG.
A sectional view, FIG. 3 is a schematic side view showing the state in which this cassette detection device is attached to a video tape recorder, and FIG. 4 is a sectional view showing a conventional cassette detection device.
It is a figure equivalent figure. 7...Cassette detection device, 8...Sensor, 9
...Video tape recorder, 10...Base, 11
...Cassette, 12...Cassette identification marker,
13... Support member, 17... Shaft, 18... Lever, 19... Holder, 21... Holder support shaft (pin), 22... Coil spring (spring), 24...
...Abutting surface.

Claims (1)

[Scope of Claim for Utility Model Registration] A sensor for reading a reflective cassette identification marker provided on the outer surface of a cassette for a video tape recorder; a support member that comes into contact with the outer surface of the cassette on which the cassette identification marker is provided and supports the sensor in opposition to the cassette identification marker while separating the sensor from the cassette identification marker by a predetermined distance when the sensor is mounted on the cassette; and a lever attached to the shaft so as to rotate to a predetermined position about the shaft, and a contact surface that projects from the lever in the direction of rotation and contacts the outer surface of the cassette at the projecting end, It consists of a holder that supports the sensor at a position closer to the lever than the contact surface, and the holder is movable by a pin that protrudes from the lever and is wrapped with a spring that biases the holder away from the lever. A supported cassette detection device.